CN107831175B - Double-sided detection device and method for surface defects of plates - Google Patents
Double-sided detection device and method for surface defects of plates Download PDFInfo
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- CN107831175B CN107831175B CN201711153444.9A CN201711153444A CN107831175B CN 107831175 B CN107831175 B CN 107831175B CN 201711153444 A CN201711153444 A CN 201711153444A CN 107831175 B CN107831175 B CN 107831175B
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- 239000000463 material Substances 0.000 claims 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000011179 visual inspection Methods 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/22—Devices influencing the relative position or the attitude of articles during transit by conveyors
- B65G47/24—Devices influencing the relative position or the attitude of articles during transit by conveyors orientating the articles
- B65G47/248—Devices influencing the relative position or the attitude of articles during transit by conveyors orientating the articles by turning over or inverting them
- B65G47/252—Devices influencing the relative position or the attitude of articles during transit by conveyors orientating the articles by turning over or inverting them about an axis substantially perpendicular to the conveying direction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
- G01N21/898—Irregularities in textured or patterned surfaces, e.g. textiles, wood
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N2021/845—Objects on a conveyor
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Abstract
The invention discloses a double-sided detection device for surface defects of plates, which comprises a plate conveying mechanism, a plate discharging conveying mechanism, a plate turning device, a detection control unit and an upper computer, wherein a gap is reserved between the plate conveying mechanism and the plate discharging conveying mechanism and is used for installing the plate turning device and is positioned at two sides of the rotation direction of the plate turning device. The detection device can quickly turn over the front surface and the back surface of the plate to detect and treat the defects in the plate, thereby realizing the purpose of high-speed and high-quality production, detecting the defects on the surface of the plate in time, and having small error and easy operation.
Description
Technical Field
The invention relates to the technical field of wood processing equipment and detection, in particular to a plate surface defect double-sided detection device and a detection method thereof.
Background
The defects on the surface of the plate are mainly detected by means of manual visual inspection under an incandescent lamp by using a visual inspection method, most of detection processes are evaluated according to the colors, textures and colors of the plate or whether the defects such as cracks, wormholes, knots and corrosion exist by means of the visual inspection and experience of the detection personnel, the manual detection method is large in detection error and is easily influenced by personal factors, detection standards among detection personnel are often inconsistent, detection results are different from person to person, over-detection and omission detection phenomena are difficult to avoid, accordingly the quality of the surface of the plate is good and poor, the detection efficiency is low, the labor intensity is high, the detection personnel work under the strong light of the incandescent lamp for a long time, the eyes of the detection personnel are greatly damaged, and particularly when the detection is carried out on the front side and the back side of the plate, the detection can be carried out only by manually turning plates with a lot of manpower consumption, and the production cost of the plate is increased. With the progress and development of technology, the manual detection method cannot meet the requirement of plate industrialized production, and technical transformation and industrial upgrading must be performed by referring to the improvement experience of the related fields so as to improve the production and detection efficiency of the plates.
Disclosure of Invention
The invention aims to provide a plate surface defect double-sided detection device and a detection method thereof, and the detection device can quickly turn over and detect the front and back sides of a plate and process defects existing in the plate, so that the purpose of high-speed and high-quality production is realized, the defects on the surface of the plate are timely detected, the error is small, the operation is easy, and the detection device is simpler, more convenient and flexible in the measurement process. In order to achieve the above purpose, the present invention adopts the following technical scheme:
according to one aspect of the invention, a double-sided defect detection device for a plate surface is provided, the double-sided defect detection device comprises a plate conveying mechanism, a plate discharging conveying mechanism, a plate turning device, a detection control unit and an upper computer, a gap is reserved between the plate conveying mechanism and the plate discharging conveying mechanism and is used for installing the plate turning device and is positioned at two sides of the rotation direction of the plate turning device, a first infrared sensor and a first image acquisition device are respectively arranged right above an inlet of the plate conveying mechanism, a second infrared sensor and a second image acquisition device are respectively arranged right above an outlet of the plate discharging conveying mechanism, a buffer baffle is further arranged at one end opposite to the inlet of the plate conveying mechanism, a third infrared sensor is arranged on the buffer baffle, an acquisition output end of the first infrared sensor, an acquisition output end of the second infrared sensor, an acquisition output end of the third infrared sensor and an acquisition output end of the second image acquisition device are respectively connected with an acquisition control unit of the detection control unit, and an image acquisition control unit of the detection control unit is connected with an image acquisition control unit through a DSP, and an image control unit is connected with an image acquisition control unit through a communication control unit.
Preferably, the plate conveying mechanism comprises a first gantry support, a first stepping motor and a plurality of conveying rollers which are parallel to each other and transversely connected and fixed between the inner sides of the first gantry support in a bridging manner, the buffer baffle is parallel to the conveying rollers, a first cross rod is arranged in the center of the top of the first gantry support, one end of the first cross rod is fixedly connected with the middle of the top end cross beam of the first gantry support, the other end of the first cross rod extends along the inlet direction of the first gantry support and is fixedly connected with the first infrared sensor, a first sliding rail is arranged in the top end cross beam of the first gantry support, the first stepping motor is fixed on the outer side of the top end cross beam of the first gantry support, an output shaft of the first stepping motor is connected with the first sliding rail, and a vertically downward first hanging rod is arranged on the first sliding rail to fix the first image acquisition device;
the plate discharging and conveying mechanism comprises a second gantry bracket, a second stepping motor and a plurality of conveying belts which are parallel to each other and transversely connected and fixed between the inner sides of the second gantry bracket in a bridging way, a second cross rod is arranged in the center of the top of the second gantry bracket, one end of the second cross rod is fixedly connected with the middle part of a top end cross beam of the second gantry bracket, the other end of the second cross rod extends along the direction of the plate turning device and is fixedly connected with a second infrared sensor, a second sliding rail is arranged in the top end cross beam of the second gantry bracket, the second stepping motor is fixed on the outer side of the top end cross beam of the second gantry bracket, an output shaft of the second stepping motor is connected with the second sliding rail, and a second hanging rod which is vertically downward is arranged on the second sliding rail and is used for fixing a second image acquisition device;
the plate turnover device comprises a third stepping motor, a central driving shaft arranged in a gap between the conveying rollers and the conveying belt and a plurality of supporting plates coaxially and fixedly arranged through the central driving shaft, wherein a plurality of rotating arms are uniformly distributed and fixed on the peripheral disc surface of each supporting plate, the third stepping motor is in transmission connection with the central driving shaft, the horizontal plane where the conveying rollers are located and the horizontal plane where the conveying belt is located are in the same plane in a mutually perpendicular mode, each corresponding conveying roller and each conveying belt are located on the same axis, and each rotating arm performs overturning motion in a gap between every two adjacent conveying rollers and a gap between every two adjacent conveying belts.
Preferably, the number of the rotating arms is the same as the number of the conveyor belts, the conveying direction of the conveyor belts is the same as the rotating direction of the rotating arms, and the conveying direction of the conveying rollers is perpendicular to the conveying direction of the conveyor belts.
Preferably, a supporting part perpendicular to the rotating arm is arranged at the end part of the rotating arm, and flexible supporting pieces are detachably arranged at two ends of the supporting part.
In the above aspect, it is further preferable that the supporting portion is an arc-shaped metal supporting portion, and the flexible supporting member is spherical or hemispherical.
In the above aspect, it is further preferable that the flexible support member is spherical, and is rotatably connected to the supporting portion.
In the above scheme, preferably, the flexible supporting member is preferably a polyurethane adhesive.
The above scheme is further preferable, wherein the first image acquisition device and the second image acquisition device adopt a laser scanner, a CMOS image sensor or a CCD image sensor.
The above scheme is further preferable that the first cross bar and the second cross bar are respectively provided with an LED dimming lamp.
According to another aspect of the present invention, there is provided a method for detecting defects of a double-sided board, comprising the steps of:
step 1: the sheet to be detected is stably fed into the inlet end of the conveying roller, the first infrared sensor 4 detects whether the sheet to be detected enters a detection area, and then the first image acquisition device is started to start to reciprocate towards the other end at one end of the top of the first gantry bracket to photograph the surface of the sheet, so that an image of the surface of the sheet is obtained;
step 2: the plate is completely sent to the conveying roller, the plate is supported in the rotating process through the rotating arm, and then the rotating arm rotates 180 degrees to turn over and transfer the plate to the conveying belt;
step 3: the plate is sent to a second infrared sensor along the conveying direction of the conveying belt to detect whether the detected plate enters a detection area, a second image acquisition device is started to start to move back and forth to the other end at one end of the top of a second gantry bracket to photograph the surface of the plate, and an image of the other surface of the plate is obtained;
step 4: and respectively sending the image acquired by the first image acquisition device and the image acquired by the second image acquisition device to the detection control unit for storage, and then uploading the images to the upper computer for image recognition and image display processing.
Preferably, the image recognition is performed according to the following steps that noise filtering processing is performed on an obtained plate surface image, the image is divided into n point cloud objects, image brightness characteristic extraction is performed on the divided point cloud objects, and defects in all the point cloud objects are searched; and performing gamma conversion on the image with the extracted brightness characteristics to enhance the contrast of the image so as to further determine the defect level.
Preferably, the defect level is not more than 0.3mm, and the image recognition is not limited to recognition detection of holes, scratches, dents, creases, cracks, wormholes, knots, corrosion, stains, color, texture, and color defects.
In summary, the technical scheme adopted by the invention has the following remarkable effects:
the detection device can quickly turn over two sides of the plate to detect and process defects existing in the plate, so that the defects on the front side and the back side of the plate are detected under the dynamic condition, and the purpose of high-speed and high-quality production of the plate is realized; the invention has higher detection speed and higher sensitivity, and can detect and evaluate the defects of the plate; the device for detecting the surface defects of the plate adopts the laser scanner to realize the surface defects scanning of the solid wood plate, has no damage to the surface of the solid wood plate, is simple to detect and operate and convenient to adjust, can also meet the application and detection requirements of different detection standards, has wide application range and good applicability, and has good market prospect.
Drawings
FIG. 1 is a schematic diagram of a device for detecting defects on a surface of a plate in a double-sided manner;
FIG. 2 is a schematic diagram of a plate feeding mechanism according to the present invention
FIG. 3 is a schematic view of the structure of the outfeed plate transport mechanism of the present invention;
fig. 4 is a front view of the flap arrangement of the present invention;
in the drawing, a 1-plate feeding and conveying mechanism, a 2-plate discharging and conveying mechanism, a 3-plate turning device, a 4-first infrared sensor, a 5-second infrared sensor, a 6-first image acquisition device, a 7-second image acquisition device, an 8-third stepping motor, a 9-driving motor, a 10-detection control unit, an 11-upper computer, a 12-buffer baffle, a 13-third infrared sensor, a 100-first gantry, a 101-conveying roller, a 102-first cross bar, a 103-first slide rail, a 104-first stepping motor, a 105-first hanging bar, a 200-second gantry, a 201-conveying belt, a 202-second cross bar, a 203-second slide rail, a 204-second stepping motor, a 205-second hanging bar, a 300-central driving shaft, a 301-supporting disc, a 302-rotating arm, a 303-supporting part, a 304-supporting part and a 1000-plate to be measured.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below by referring to the accompanying drawings and by illustrating preferred embodiments. It should be noted, however, that many of the details set forth in the description are merely provided to provide a thorough understanding of one or more aspects of the invention, and that these aspects of the invention may be practiced without these specific details.
As shown in fig. 1, the double-sided defect detection device for the surface defect of the plate according to the invention comprises a plate conveying mechanism 1, a plate discharging conveying mechanism 2, a plate turning device 3, a detection control unit 10 and an upper computer 11, wherein a gap space is reserved between the plate conveying mechanism 1 and the plate discharging conveying mechanism 2 and is used for installing the plate turning device 3 and is positioned at two sides of the rotation direction of the plate turning device 3, a first infrared sensor 4 and a first image acquisition device 6 are respectively arranged right above an inlet of the plate conveying mechanism 1, a second infrared sensor 5 and a second image acquisition device 7 are respectively arranged right above an outlet of the plate discharging conveying mechanism 2, a buffer baffle 12 is also arranged at one end opposite to the inlet of the plate conveying mechanism 1, a third infrared sensor 13 is arranged on the buffer baffle, the acquisition output end of the first infrared sensor 4, the acquisition output end of the first image acquisition device 6, the acquisition output end of the second infrared sensor 5, the acquisition output end of the third infrared sensor 13 and the acquisition output end of the second image acquisition device 7 are respectively and electrically connected with the acquisition input end of the detection control unit 10, the output end of the detection control unit 10 is in communication connection with the upper computer 11, the first image acquisition device 6 and the second image acquisition device 7 adopt a laser scanner, a CMOS image sensor or a CCD image sensor, the first cross bar 102 and the second cross bar 202 are respectively provided with an LED dimming lamp, when the laser scanner is adopted for scanning, the surfaces of the detected plates can be illuminated by LEDs at the same time, the brightness of the surfaces of the detected plates is adjusted, due to the insufficient light of the detection environment and the instability and the time difference, the LED dimming lamp is configured for light supplementing and is easy to be interfered by external factors, so that the influence of a light source of a detection environment on a shooting effect can be eliminated.
In the invention, as shown in fig. 1, 2 and 3, the plate conveying mechanism 1 comprises a first gantry bracket 100, a first stepping motor 104 and a plurality of conveying rollers 101 which are parallel to each other and transversely connected and fixed between the inner sides of the first gantry bracket 100 in a bridging manner, each conveying roller is connected with a driving motor in a transmission manner (not shown) through a chain, so that a plate is conveyed to the turnover device 3, the buffer baffle 12 is parallel to the conveying rollers 101, a first cross bar 102 is arranged in the center of the top of the first gantry bracket 100, one end of the first cross bar 102 is fixedly connected with the middle of the top end cross bar of the first gantry bracket 100, the other end of the first cross bar 102 is fixedly connected with the first infrared sensor 4 after extending along the inlet direction of the first gantry bracket 100, a first sliding rail 103 is arranged in the top end cross bar of the first gantry bracket 100, the first stepping motor 104 is fixed on the outer side of the top end cross bar of the first gantry bracket 100, an output shaft 103 of the first stepping motor 104 is connected with the first sliding rail 103, and a first image acquisition device is arranged on the first vertical hanging rail 105 downwards; therefore, the first stepping motor 104 drives the first sliding rail 103 to slide back and forth in the top end cross beam of the first gantry 100 for measurement, and the problem that the boundary of the plate cannot be detected in place is reduced. The plate discharging and conveying mechanism 2 comprises a second gantry 200, a second stepping motor 204 and a plurality of conveying belts 201 which are parallel to each other and transversely connected and fixed between the inner sides of the second gantry 200 in a bridging way, wherein each conveying belt is connected with a driving motor 9 in a transmission way through a chain transmission way, so that a plate is conveyed onto the turnover device 3, a second cross rod 202 is arranged in the center of the top of the second gantry 200, one end of the second cross rod 202 is fixedly connected with the middle part of the top end cross beam of the second gantry 200, the other end of the second cross rod 202 extends along the direction of the turnover device 3 and is fixedly connected with the second infrared sensor 5, a second slide rail 203 is arranged in the top end cross beam of the second gantry 200, the second stepping motor 204 is fixedly connected with the outer side of the top end cross beam of the second gantry 200, an output shaft of the second stepping motor 204 is connected with the second slide rail 203, a vertically downward second hanging rod 205 is arranged on the second slide rail 203, and the second image acquisition device 7 is fixedly arranged, so that the problem of the sliding of the plate is not detected in the top end of the second gantry 200 when the second gantry 200 is detected and the sliding position of the plate is detected; before image scanning and detection, the position of the plate to be transmitted is detected through the infrared sensor, the laser scanner is started to perform positioning through the infrared sensor, so that the working time of the laser scanner is reduced, the laser scanner can be ensured to scan in a relatively stable state after detection and positioning, the processing of scanned image data is reduced, and the detection efficiency is improved.
In the invention, as shown in fig. 1 and 4, the plate turnover device 3 comprises a third stepping motor 8, a central driving shaft 300 arranged in a gap space between a conveying roller 101 and a conveying belt 201 and a plurality of supporting plates 301 coaxially and fixedly arranged through the central driving shaft 3, a plurality of rotating arms 302 are uniformly distributed and fixedly arranged on the peripheral disc surface of each supporting plate, the third stepping motor 8 is in transmission connection with the central driving shaft 3, the horizontal plane of the conveying roller 101 and the horizontal plane of the conveying belt 201 are mutually perpendicular and are positioned in the same plane, each corresponding conveying roller 101 and conveying belt 201 are mutually positioned on the same axis, the conveying direction of the conveying belt 201 is the same as the rotating direction of the rotating arms 302, the number of the rotating arms 302 is the same as the number of the conveying belts 201, the conveying direction of the conveying rollers 101 are mutually perpendicular relative to the conveying direction of the conveying belts 201, each rotating arm 302 makes turnover motion in the gaps between the adjacent conveying rollers 101 and the gaps between the adjacent conveying belts 201, so that a plate to be detected after the conveying rollers 100 are turned over to the rotating arms 302 and the conveying belts 201, the plate to be detected on the conveying belts 201, and the plate to be detected to be failed, and the plate is taken out from the surface to be detected, and the plate is processed; a supporting portion 303 perpendicular to the rotating arm 302 is provided at an end portion of the rotating arm 302, and flexible supports 304 are detachably provided at both ends of the supporting portion 303. The supporting part 303 is an arc-shaped metal supporting part, and the flexible supporting piece 304 is spherical or hemispherical; the flexible supporting member 304 is spherical, the flexible supporting member 304 is rotatably connected with the supporting portion 303, preferably, the flexible supporting member in the invention adopts a hemispherical shape, when the supporting portion 303 supports the tested plate from the conveying roller 101, the tested plate is easy to slide randomly, and the surface of the tested plate can be scratched, so that the tested plate is supported by adopting the plane portion of the hemispherical flexible supporting member, and the flexible supporting member 304 is preferably made of plastic, thereby effectively avoiding the tested plate from sliding and losing the surface of the tested plate.
In the invention, referring to fig. 1, 2, 3 and 4, during the detection of the turning plate, the front-mounted conveying roller 101 conveys the detected plate to the lower part of the first infrared sensor 4 and the first image acquisition device 6 for front defect detection, the turning plate device 3 is driven by the third stepping motor 13, the rotating arm 302 arranged on the central driving shaft 300 rotates together, the rotating arm 302 removes the detected plate on the conveying roller 101, and the rotating arm 302 drives the detected plate to move towards the direction of the plate outlet conveying mechanism 2; because gaps exist between the adjacent conveying rollers 101 and between the adjacent conveying belts 201, the rotating arms 302 cannot collide or interfere with the conveying rollers 1 and the conveying belts, when the fan-shaped openings between the rotating arms 302 of the two adjacent groups are flush with the conveying rollers 201, the conveying rollers 201 stop conveying, after the detected plate continues to be conveyed into the supporting range of the rotating arms 302, the third stepping motor 8 continues to be started, the detected plate is supported by the rotating arms 302, the rotating arms 302 rotate 180 degrees, reach the upper side of the conveying belts 201 and fall on the plane where the conveying belts 201 are located, then the central driving shaft 300 stops running, the conveying belts 201 convey the detected plate to the scanning working range of the second infrared sensor 5 and the second image acquisition device 7, meanwhile, the plate conveying mechanism 1 on the other side starts to scan, the rotating arms 302 continue to rotate to perform plate turning operation, and work circulation is performed.
According to another aspect of the present invention, the present invention also provides a method for detecting defects of a double-sided board, including the steps of:
step 1: the sheet 1000 to be measured is stably fed into the inlet end of the conveying roller 101, the first infrared sensor 4 detects whether the sheet 1000 to be measured enters a detection area, and then the first image acquisition device 6 is started to start to reciprocate to the other end at one end of the top of the first gantry 100 to photograph the surface of the sheet, so that an image of the surface of the sheet is obtained;
step 2: as the sheet 1000 is completely fed onto the conveying roller 101, the sheet 1000 is lifted up during rotation by the rotating arm 302, and then the rotating arm 302 rotates 180 ° to turn over and transfer the sheet 1000 onto the conveyor 201;
step 3: the plate 100 is sent to the second infrared sensor 5 along the conveying direction of the conveying belt 201 to detect whether the detected plate 1000 enters a detection area, and then the second image acquisition device 7 is started to start to make reciprocating movement to the other end from one end of the top of the second gantry 200 to take a picture of the surface of the plate, so as to acquire an image of the other surface of the plate;
step 4: the first image acquisition device 6 acquires an image of the surface of the plate and the second image acquisition device 7 acquires an image of the other surface of the plate, the images are sent to the detection control unit 10 for storage, and then the images are uploaded to the upper computer 11 for image recognition and image display processing; the image recognition is carried out according to the following steps that noise filtering processing is carried out on an obtained plate surface image, the image is divided into n point cloud objects, image brightness characteristic extraction is carried out on the divided point cloud objects, and defects in all the point cloud objects are searched; the gamma conversion is carried out on the image with the extracted brightness characteristics, the contrast of the image is enhanced, so that the defect level is further determined, the influence of color intensity, ambient light or shadow in the image scanning process is eliminated by dividing the image into n point cloud objects, the scanned image is further refined, and the accuracy and the precision of the sheet surface defect detection are improved; and the defect grade is not more than 0.3mm, the plate with the defect grade being more than 0.3mm is removed after the unqualified product is confirmed, and the image identification is not limited to the identification and detection of holes, scratches, dents, folds, cracks, wormholes, knots, corrosion, stains, colors, textures and color defects.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (5)
1. The utility model provides a two-sided detection device of panel surface defect which characterized in that: the defect double-sided detection device comprises a plate conveying mechanism, a plate discharging conveying mechanism, a plate turning device, a detection control unit and an upper computer, wherein a gap is reserved between the plate conveying mechanism and the plate discharging conveying mechanism and is used for installing the plate turning device and is positioned at two sides of the rotation direction of the plate turning device, a first infrared sensor and a first image acquisition device are respectively arranged right above an inlet of the plate conveying mechanism, a second infrared sensor and a second image acquisition device are respectively arranged right above an outlet of the plate discharging conveying mechanism, a buffer baffle is further arranged at one end opposite to the inlet of the plate conveying mechanism, a third infrared sensor is arranged on the buffer baffle, and an acquisition output end of the first infrared sensor, an acquisition output end of the first image acquisition device, an acquisition output end of the second infrared sensor and an acquisition output end of the second image acquisition device are respectively and electrically connected with an acquisition input end of the detection control unit, and an output end of the detection control unit is in communication connection with the upper computer;
the plate conveying mechanism comprises a first gantry support, a first stepping motor and a plurality of conveying rollers which are parallel to each other and transversely connected and fixed between the inner sides of the first gantry support in a bridging manner, the buffer baffle is parallel to the conveying rollers, a first cross rod is arranged in the center of the top of the first gantry support, one end of the first cross rod is fixedly connected with the middle of a top end cross beam of the first gantry support, the other end of the first cross rod extends along the inlet direction of the first gantry support and is fixedly connected with the first infrared sensor, a first sliding rail is arranged in the top end cross beam of the first gantry support, the first stepping motor is fixed on the outer side of the top end cross beam of the first gantry support, an output shaft of the first stepping motor is connected with the first sliding rail, and a vertically downward first hanging rod is arranged on the first sliding rail to fix the first image acquisition device;
the plate discharging and conveying mechanism comprises a second gantry bracket, a second stepping motor and a plurality of conveying belts which are parallel to each other and transversely connected and fixed between the inner sides of the second gantry bracket in a bridging way, a second cross rod is arranged in the center of the top of the second gantry bracket, one end of the second cross rod is fixedly connected with the middle part of a top end cross beam of the second gantry bracket, the other end of the second cross rod extends along the direction of the plate turning device and is fixedly connected with a second infrared sensor, a second sliding rail is arranged in the top end cross beam of the second gantry bracket, the second stepping motor is fixed on the outer side of the top end cross beam of the second gantry bracket, an output shaft of the second stepping motor is connected with the second sliding rail, and a second hanging rod which is vertically downward is arranged on the second sliding rail and is used for fixing a second image acquisition device;
the plate turnover device comprises a third stepping motor, a central driving shaft arranged in a gap between the conveying rollers and the conveying belt and a plurality of supporting plates coaxially and fixedly arranged through the central driving shaft, wherein a plurality of rotating arms are uniformly distributed and fixed on the peripheral disc surface of each supporting plate, the third stepping motor is in transmission connection with the central driving shaft, the horizontal plane where the conveying rollers are positioned and the horizontal plane where the conveying belt is positioned are mutually perpendicular and are positioned in the same plane, each corresponding conveying roller and each conveying belt are mutually positioned on the same axis, and each rotating arm performs overturning motion in a gap between adjacent conveying rollers and a gap between adjacent conveying belts;
the number of the rotating arms is the same as that of the conveying belts, the conveying direction of the conveying belts is the same as that of the rotating arms, and the conveying direction of the conveying rollers is perpendicular to the conveying direction of the conveying belts; the end part of the rotating arm is provided with a supporting part vertical to the rotating arm, and two ends of the supporting part are detachably provided with flexible supporting pieces; the supporting part is an arc-shaped metal supporting part, and the flexible supporting piece is spherical or hemispherical;
when the turning plate is detected, the front-mounted conveying roller conveys the detected plate to the position below the first infrared sensor and the first image acquisition device for front defect detection, the turning plate device is driven by the third stepping motor, the rotating arm arranged on the central driving shaft rotates together, the rotating arm removes the detected plate on the conveying roller, and the rotating arm drives the detected plate to move towards the direction of the plate discharging conveying mechanism; because gaps exist between the adjacent conveying rollers and between the adjacent conveying belts, the rotating arms cannot collide or interfere with the conveying rollers and the conveying belts, when the fan-shaped openings between the rotating arms of the two adjacent groups are flush with the conveying rollers, the conveying rollers pause conveying, after the detected plates continue to be conveyed into the supporting range of the rotating arms, the third stepping motor continues to be started, the detected plates are supported by the rotating arms, rotate 180 degrees along with the rotating arms to reach the upper part of the conveying belts and fall on the plane where the conveying belts are located, then the central driving shaft pauses running, the conveying belts convey the detected plates to the scanning working range of the second infrared sensor and the second image acquisition device, meanwhile, the plate conveying mechanism at the other side starts scanning, and the rotating arms continue to rotate to perform plate turning operation to perform working circulation.
2. The sheet material surface defect double-sided detection device according to claim 1, wherein: the flexible supporting piece is preferably made of high-strength adhesive.
3. The sheet material surface defect double-sided detection device according to claim 1, wherein: and the first cross rod and the second cross rod are respectively provided with an LED dimming lamp.
4. A detection method using a sheet material surface defect double-sided detection apparatus according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:
step 1: the sheet to be detected is stably fed into the inlet end of the conveying roller, the first infrared sensor 4 detects whether the sheet to be detected enters a detection area, and then the first image acquisition device is started to start to reciprocate towards the other end at one end of the top of the first gantry bracket to photograph the surface of the sheet, so that an image of the surface of the sheet is obtained;
step 2: the plate is completely sent to the conveying roller, the plate is supported in the rotating process through the rotating arm, and then the rotating arm rotates 180 degrees to turn over and transfer the plate to the conveying belt;
step 3: the plate is sent to a second infrared sensor along the conveying direction of the conveying belt to detect whether the detected plate enters a detection area, a second image acquisition device is started to start to move back and forth to the other end at one end of the top of a second gantry bracket to photograph the surface of the plate, and an image of the other surface of the plate is obtained;
step 4: the method comprises the steps of respectively sending an image of the surface of the plate obtained by a first image acquisition device and an image of the other surface of the plate obtained by a second image acquisition device into a detection control unit for storage, and then uploading the images to an upper computer for image recognition and image display processing; the image recognition is carried out according to the following steps that noise filtering processing is carried out on the obtained plate surface image, the image is divided into n point cloud objects, image brightness characteristic extraction is carried out on the divided point cloud objects, and defects in all the point cloud objects are searched; and performing gamma conversion on the image with the extracted brightness characteristics to enhance the contrast of the image so as to further determine the defect level.
5. The method of claim 4, wherein: the defect grade is not more than 0.3mm, and the image identification is not limited to the identification and detection of holes, scratches, dents, creases, cracks, wormholes, knots, corrosion, stains, colors, textures and color defects.
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| CN201711153444.9A CN107831175B (en) | 2017-11-17 | 2017-11-17 | Double-sided detection device and method for surface defects of plates |
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